from machine import Pin
from utime import sleep

led_r = machine.Pin(5, Pin.OUT)
led_y = machine.Pin(6, Pin.OUT)
led_g = machine.Pin(12, Pin.OUT)

print("TRAFFIC LIGHT SIMULATION")

while True:
    led_r.on()
    led_y.off()
    led_g.off()
    sleep(10)

    led_r.on()
    led_y.on()
    led_g.off()
    sleep(2)

    led_r.off()
    led_y.off()
    led_g.on()
    sleep(5)